CN110513248A - It is a kind of with the blower award setting method and device for actively supporting power grid function - Google Patents
It is a kind of with the blower award setting method and device for actively supporting power grid function Download PDFInfo
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- CN110513248A CN110513248A CN201910754511.5A CN201910754511A CN110513248A CN 110513248 A CN110513248 A CN 110513248A CN 201910754511 A CN201910754511 A CN 201910754511A CN 110513248 A CN110513248 A CN 110513248A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/84—Modelling or simulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Control Of Eletrric Generators (AREA)
- Wind Motors (AREA)
Abstract
The present invention relates to a kind of with the blower award setting method and device for actively supporting power grid function, it include: according to the generator power setting value under target voltage, target frequency and target voltage, the generator electromagnetic torque quiescent value under target operating condition is calculated, target operating condition is the operating condition that generator works in normal electricity system mode;It is poor that generator electromagnetic torque value under generator electromagnetic torque quiescent value and current working under target operating condition is made, and obtains the pre- variable of generator electromagnetic torque;According to the pre- variable of generator electromagnetic torque, propeller pitch angle variable quantity is calculated, and pitch-controlled system is controlled according to propeller pitch angle variable quantity.The present invention can adjust wind wheel propeller pitch angle by way of controlling in advance in real time, reduce the probability that hypervelocity failure occurs in generator, be conducive to the stable operation of wind-driven generator.
Description
Technical field
The present invention relates to a kind of with the blower award setting method and device for actively supporting power grid function, belongs to wind-force
Technical field of power generation.
Background technique
As a kind of renewable and clean energy resource, wind-powered electricity generation is fast-developing in China, and a large amount of wind power plants are in blowout
Occur, the wind-power electricity generation amount in part province local area generated energy accounting more than 40%.Stability of the wind-powered electricity generation to electric system
More and more important, in face of power system voltage and frequency fluctuation problem, wind-powered electricity generation can be actively engaged in power grid adjusting, and be propped up with this
The function of supportting power grid becomes the new grid-connected demand of electric system.
In the power system, power load often fluctuates, and fluctuates so as to cause network voltage, frequency, electricity
After net voltage, frequency departure normal value, power plant can adjust own power output actively to stablize power grid.Wind power station in the past
It is not involved in power grid adjusting, after fluctuation occurs in power grid, the conventional power plants (waterpower, thermal power plant) relied primarily in electric system are adjusted
Save network voltage and frequency.As more and more new energy power plant are connected to the grid, generation of electricity by new energy amount is in the power system
Accounting is gradually increased, and the ability for relying solely on conventional power plants support power grid has become limited, and new energy power plant is allowed to participate in support
Power grid adjusting has become new demand.Blower under new energy active support, which refers to start, is actively engaged in mains frequency, voltage
The blower of regulatory function, if there is blower electric system active frequency modulation, voltage regulation function to be believed that it, there are new energy actives
Supporting condition.
Currently, the groundwork mode of variable blade control system are as follows: the following operating condition of rated wind speed, control propeller pitch angle are maintained at most
The figure of merit, to maximal wind-energy utilization rate to be obtained;The above operating condition of rated wind speed, pitch-controlled system closely monitor generator speed, control
Propeller pitch angle processed is to avoid generator hypervelocity.Because variable blade control system generally uses feedback control technology, and feedback control technology
It is a kind of subsequent adjustment mechanism, i.e., by acquiring the revolving speed of generator in real time, when generator speed is more than setting value, controls paddle
Elongation, and generator speed has exceeded the speed limit at this time, along with wind wheel and blade rotator inertia are big, after wind wheel torque mutation,
Variable blade control system cannot quickly and effectively control wind wheel propeller pitch angle sometimes, to generator hypervelocity machine halt trouble occur.
Summary of the invention
The object of the present invention is to provide a kind of with the blower award setting method and device for actively supporting power grid function,
Wind wheel propeller pitch angle cannot be quickly and effectively controlled for solving existing variable blade control system, leads to generator hypervelocity machine halt trouble
Problem.
In order to solve the above technical problems, the present invention provides a kind of with the blower propeller pitch angle control for actively supporting power grid function
Method processed, comprising the following steps:
According to the generator power setting value under target voltage, target frequency and target voltage, calculate under target operating condition
Generator electromagnetic torque quiescent value, the target operating condition are the operating condition that generator works in normal electricity system mode;
It is poor that generator electromagnetic torque value under generator electromagnetic torque quiescent value and current working under target operating condition is made,
Obtain the pre- variable of generator electromagnetic torque;
According to the pre- variable of generator electromagnetic torque, propeller pitch angle variable quantity is calculated, and variable pitch is controlled according to propeller pitch angle variable quantity
System.
In order to solve the above technical problems, the present invention also provides a kind of with the blower propeller pitch angle for actively supporting power grid function
Control device, including processor and memory, the processor are used to handle the instruction of storage in the memory to realize
Following method:
According to the generator power setting value under target voltage, target frequency and target voltage, calculate under target operating condition
Generator electromagnetic torque quiescent value, the target operating condition are the operating condition that generator works in normal electricity system mode;
It is poor that generator electromagnetic torque value under generator electromagnetic torque quiescent value and current working under target operating condition is made,
Obtain the pre- variable of generator electromagnetic torque;
According to the pre- variable of generator electromagnetic torque, propeller pitch angle variable quantity is calculated, and variable pitch is controlled according to propeller pitch angle variable quantity
System.
The beneficial effects of the present invention are: by calculate target operating condition under generator electromagnetic torque quiescent value and by its with work as
Generator electromagnetic torque value under preceding operating condition is compared, the available pre- variable of generator electromagnetic torque, and then can be found out
Propeller pitch angle variable quantity, this preparatory control mode can adjust wind wheel propeller pitch angle in real time, reduce generator and hypervelocity failure occur
Probability, be conducive to the stable operation of wind-driven generator.
As the further improvement of method and apparatus, the generator electromagnetic torque quiescent value under target operating condition in order to obtain,
Calculate target operating condition under generator electromagnetic torque quiescent value the step of include:
Using generator unit stator magnetic linkage direction as stator d axis direction, according to target voltage and target frequency, target electricity is calculated
The generator unit stator d axis component U of pressuredWith q axis component Uq;
According to the generator unit stator d axis component U under target voltagedWith q axis component UqAnd the generator function under target voltage
Rate setting value calculates d, q shaft current component of the generator unit stator under target voltage and d, q shaft current component of rotor, calculates
Formula are as follows:
Wherein, IdAnd IqD, q shaft current component of generator unit stator respectively under target voltage, idAnd iqRespectively mesh
D, q shaft current component of the generator amature under voltage are marked, R is the every phase winding resistance of generator unit stator, ωmFor generator unit stator
Magnetic linkage angular velocity of rotation;Lm,LseMaximum mutual inductance respectively between generator windings, the every phase winding leakage inductance of generator unit stator, P and Q divide
It Wei not active power setting value and reactive power setting value in the generator power setting value under target voltage;
According to d, q shaft current component of d, q shaft current component of the generator unit stator under target voltage and rotor, mesh is calculated
Mark the generator electromagnetic torque quiescent value under operating condition, calculation formula are as follows:
Wherein, TpFor the generator electromagnetic torque quiescent value under target operating condition.
As the further improvement of method and apparatus, propeller pitch angle variable quantity, the calculating of propeller pitch angle variable quantity are public in order to obtain
Formula are as follows:
Wherein, Δ β is propeller pitch angle variable quantity, Δ TeFor the pre- variable of generator electromagnetic torque, Δ Te=Tp-Tc, TcIt is current
Generator electromagnetic torque value under operating condition, K are the reduction ratio of wind-driven generator wheel-box, and k (β, λ) is wind wheel turning moment and wind
The slope between propeller pitch angle β is taken turns, λ is tip speed ratio.
It is oblique between wind wheel turning moment and wind wheel propeller pitch angle in order to obtain as the further improvement of method and apparatus
Rate, k (β, λ) is obtained by simulation calculation, calculation formula are as follows:
Wherein, T is wind wheel turning moment.
As the further improvement of method and apparatus, in order to obtain the generator power setting value under target voltage, target
Generator power setting value under voltage includes active set value of the power P and reactive power setting value Q, active power setting value P
It can be changed according to wind speed power curve combination Power Systems with reactive power setting value Q and require to precalculate out.
Detailed description of the invention
Fig. 1 is the flow chart that the present invention has the blower award setting method for actively supporting power grid function.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing and specific implementation
The present invention will be described in further detail for example.
With the blower award setting embodiment of the method for actively supporting power grid function:
All power network fluctuations (frequency or voltage fluctuation) can all cause generator electromagnetic torque to change, when electric system is from just
For normal state offset to the process of abnormality, target operating condition is uncertain;But electric system restores from abnormality to just
In normal state procedure, target operating condition is predictable.For the blower under new energy actively support requirement, network voltage is adjusted
Speed and network voltage target value and mains frequency target value are predictable, therefore extensive from abnormality for electric system
It is multiple to may be implemented " generator torque prediction, in advance variable pitch " to this process of normal condition, in this process, " current working "
Refer to operating condition when generator is in abnormal electric network state, that is, operating condition when deviation normal electricity system index;" target work
Condition " refers to that generator works operating condition in normal electricity system mode, that is, when being restored to normal electricity system index
Operating condition.In normal conditions, electric system index anticipated that.
Based on above-mentioned analysis, it present embodiments provides a kind of with the blower award setting side for actively supporting power grid function
Method, when system prediction to generator electromagnetic torque, which will appear, to decline to a great extent, generator hypervelocity modifies variable pitch system in order to prevent
System instruction improves control speed, effectively reduces without the just modification pitch-controlled system instruction until generator overspeed signal occurs
The probability of wind-driven generator hypervelocity failure.The corresponding flow chart of this method is as shown in Figure 1, comprising the following steps:
(1) it is emulated, is obtained between wind wheel turning moment and wind wheel propeller pitch angle using wind-driven generator simulation software
Corresponding relationship, and carry out linearization process and obtain the slope between wind wheel turning moment and wind wheel propeller pitch angle.
It is emulated to obtain between wind wheel turning moment and wind wheel propeller pitch angle specifically, can use GH Blade software
Corresponding relationship, and linearization process is done, calculate slope:
Wherein, slope of the k (β, λ) between wind wheel turning moment and wind wheel propeller pitch angle β, T are the wind wheel rotation that wind energy generates
Torque, λ are tip speed ratio.
(2) it according to the generator power setting value under target voltage, target frequency and target voltage, calculates under target operating condition
Generator electromagnetic torque quiescent value.
Specifically, the step of calculating the generator electromagnetic torque quiescent value under target operating condition includes:
A. using generator unit stator magnetic linkage direction as stator d axis direction, according to target voltage and target frequency, target is calculated
Generator unit stator d axis component U under voltagedWith q axis component Uq, calculation formula are as follows:
Wherein, θ is generator unit stator magnetic linkage electrical angle, Vg *For target voltage VgPhase voltage amplitude, ω be voltage angle speed
Degree, the π of ω=2 fg, fgFor target frequency, China Power Grids Frequency Index is 50Hz, takes fg=50Hz.
B. according to the generator unit stator d axis component U under target voltagedWith q axis component UqAnd the generator under target voltage
Set value of the power calculates d, q shaft current component of the generator unit stator under target voltage and d, q shaft current component of rotor, meter
Calculate formula are as follows:
Wherein, IdAnd IqD, q shaft current component of generator unit stator respectively under target voltage, idAnd iqRespectively mesh
D, q shaft current component of the generator amature under voltage are marked, R is the every phase winding resistance of generator unit stator, ωmFor generator unit stator
Magnetic linkage angular velocity of rotation;Lm,LseMaximum mutual inductance, the every phase winding leakage inductance of generator unit stator respectively between generator windings;P and Q points
It Wei not active power setting value and reactive power setting value in the generator power setting value under target voltage.
It should be noted that generator power is constrained by wind speed and electric network state, under normal electric network state, generator has
Function power maximum output can be calculated by wind speed power curve, because power grid adjustment process is than very fast, wind speed in a short time
Amplitude of variation is not too large, it is believed that current working wind speed is consistent with target operating condition wind speed.Therefore, active power setting value P
It can be changed according to wind speed power curve combination Power Systems with reactive power setting value Q and require to precalculate out, by
Belong to the prior art in calculating process, details are not described herein again.
C. it according to d, q shaft current component of d, q shaft current component of the generator unit stator under target voltage and rotor, calculates
Generator electromagnetic torque quiescent value under target operating condition, calculation formula are as follows:
Wherein, TpFor the generator electromagnetic torque quiescent value under target operating condition.
(3) the generator electromagnetic torque value under the generator electromagnetic torque quiescent value and current working under target operating condition is made
Difference obtains the pre- variable of generator electromagnetic torque, that is, has:
ΔTe=Tp-Tc
Wherein, Δ TeFor the pre- variable of generator electromagnetic torque, TcFor current working generator electromagnetic torque, current working hair
Motor electromagnetic torque can directly be collected from current transformer or sensor.
(4) according to the pre- variable of generator electromagnetic torque, propeller pitch angle variable quantity is calculated, and is controlled and is become according to propeller pitch angle variable quantity
Oar system.
Specifically, the calculation formula of propeller pitch angle variable quantity are as follows:
Wherein, Δ β is propeller pitch angle variable quantity, and K is the reduction ratio of wind-driven generator wheel-box, and k (β, λ) is in step (1)
Slope between obtained wind wheel turning moment and wind wheel propeller pitch angle β, λ are tip speed ratio.
It should be noted that the purpose of step (1) is the slope obtained between wind wheel turning moment and wind wheel propeller pitch angle, belong to
Preparation before blower controlling electromagnetic torque starts.During blower award setting, which is substituted into step (4)
Formula in seek propeller pitch angle variable quantity.As other embodiments, this has the blower pitch for actively supporting power grid function
Angle control method can not also include step (1) this preparation, but directly by existing wind wheel turning moment with
Slope between wind wheel propeller pitch angle substitutes into the calculation formula of propeller pitch angle variable quantity, and then seeks out propeller pitch angle variable quantity, and root
According to propeller pitch angle variable quantity modification pitch-controlled system instruction, pitch-controlled system is controlled.
There is the blower award setting method for actively supporting power grid function by using above-mentioned, can be sent out with look-ahead
Motor electromagnetic torque variable quantity adjusts wind wheel propeller pitch angle then according to electromagnetic torque premeasuring in real time, effectively reduces wind-force hair
The number of Motor Over Speed failure.
With the blower award setting Installation practice for actively supporting power grid function:
It present embodiments provides a kind of with the blower award setting device for actively supporting power grid function, including memory
And processor, the processor are to realize that above-mentioned having actively supports for executing instruction stored in memory, core
The blower award setting method of power grid function.To those skilled in the art, can be had actively according to above-mentioned
The blower award setting method for supporting power grid function, generates corresponding computer instruction, has actively support electricity to obtain this
The blower award setting device of net function.Actively the blower award setting method of power grid function has been supported since this has
Above-mentioned with being described in detail in the blower award setting embodiment of the method for actively supporting power grid function, herein not
It repeats again.
Finally it should be noted that the above examples are only used to illustrate the technical scheme of the present invention rather than to its protection scope
Limitation, although the application is described in detail referring to above-described embodiment, those of ordinary skill in the art should
Understand, those skilled in the art read the specific embodiment of application can still be carried out after the application various changes, modification or
Person's equivalent replacement, but these changes, modification or equivalent replacement, within the scope of the claims of the present invention.
Claims (10)
1. a kind of with the blower award setting method for actively supporting power grid function, which comprises the following steps:
According to the generator power setting value under target voltage, target frequency and target voltage, the power generation under target operating condition is calculated
Electromechanical magnetic torque quiescent value, the target operating condition are the operating condition that generator works in normal electricity system mode;
It is poor that generator electromagnetic torque value under generator electromagnetic torque quiescent value and current working under target operating condition is made, and obtains
The pre- variable of generator electromagnetic torque;
According to the pre- variable of generator electromagnetic torque, propeller pitch angle variable quantity is calculated, and pitch-controlled system is controlled according to propeller pitch angle variable quantity.
2. according to claim 1 have the blower award setting method for actively supporting power grid function, which is characterized in that
Calculate target operating condition under generator electromagnetic torque quiescent value the step of include:
Using generator unit stator magnetic linkage direction as stator d axis direction, according to target voltage and target frequency, calculate under target voltage
Generator unit stator d axis component UdWith q axis component Uq;
According to the generator unit stator d axis component U under target voltagedWith q axis component UqAnd the generator power under target voltage is set
Definite value calculates d, q shaft current component of the generator unit stator under target voltage and d, q shaft current component of rotor, calculation formula
Are as follows:
Wherein, IdAnd IqD, q shaft current component of generator unit stator respectively under target voltage, idAnd iqRespectively target voltage
Under generator amature d, q shaft current component, R be the every phase winding resistance of generator unit stator, ωmFor the rotation of generator unit stator magnetic linkage
Tarnsition velocity;Lm,LseMaximum mutual inductance respectively between generator windings, the every phase winding leakage inductance of generator unit stator, P and Q are respectively mesh
Mark the active power setting value and reactive power setting value in the generator power setting value under voltage;
According to d, q shaft current component of d, q shaft current component of the generator unit stator under target voltage and rotor, target work is calculated
Generator electromagnetic torque quiescent value under condition, calculation formula are as follows:
Wherein, TpFor the generator electromagnetic torque quiescent value under target operating condition.
3. according to claim 2 have the blower award setting method for actively supporting power grid function, which is characterized in that
The calculation formula of propeller pitch angle variable quantity are as follows:
Wherein, Δ β is propeller pitch angle variable quantity, Δ TeFor the pre- variable of generator electromagnetic torque, Δ Te=Tp-Tc, TcFor current working
Under generator electromagnetic torque value, K be wind-driven generator wheel-box reduction ratio, k (β, λ) be wind wheel turning moment and wind wheel oar
Slope between elongation β, λ are tip speed ratio.
4. according to claim 3 have the blower award setting method for actively supporting power grid function, which is characterized in that
K (β, λ) is obtained by simulation calculation, calculation formula are as follows:
Wherein, T is wind wheel turning moment.
5. according to claim 1 have the blower award setting method for actively supporting power grid function, which is characterized in that
Generator power setting value under target voltage includes active set value of the power P and reactive power setting value Q, active power setting
Value P and reactive power setting value Q can change according to wind speed power curve combination Power Systems to be required to precalculate out.
6. a kind of with the blower award setting device for actively supporting power grid function, which is characterized in that including processor and deposit
Reservoir, the processor are used to handle the instruction of storage in the memory to realize following method:
According to the generator power setting value under target voltage, target frequency and target voltage, the power generation under target operating condition is calculated
Electromechanical magnetic torque quiescent value, the target operating condition are the operating condition that generator works in normal electricity system mode;
It is poor that generator electromagnetic torque value under generator electromagnetic torque quiescent value and current working under target operating condition is made, and obtains
The pre- variable of generator electromagnetic torque;
According to the pre- variable of generator electromagnetic torque, propeller pitch angle variable quantity is calculated, and pitch-controlled system is controlled according to propeller pitch angle variable quantity.
7. according to claim 6 have the blower award setting device for actively supporting power grid function, which is characterized in that
Calculate target operating condition under generator electromagnetic torque quiescent value the step of include:
Using generator unit stator magnetic linkage direction as stator d axis direction, according to target voltage and target frequency, calculate under target voltage
Generator unit stator d axis component UdWith q axis component Uq;
According to the generator unit stator d axis component U under target voltagedWith q axis component UqAnd the generator power under target voltage is set
Definite value calculates d, q shaft current component of the generator unit stator under target voltage and d, q shaft current component of rotor, calculation formula
Are as follows:
Wherein, IdAnd IqD, q shaft current component of generator unit stator respectively under target voltage, idAnd iqRespectively target voltage
Under generator amature d, q shaft current component, R be the every phase winding resistance of generator unit stator, ωmFor the rotation of generator unit stator magnetic linkage
Tarnsition velocity;Lm,LseMaximum mutual inductance respectively between generator windings, the every phase winding leakage inductance of generator unit stator, P and Q are respectively mesh
Mark the active power setting value and reactive power setting value in the generator power setting value under voltage;
According to d, q shaft current component of d, q shaft current component of the generator unit stator under target voltage and rotor, target work is calculated
Generator electromagnetic torque quiescent value under condition, calculation formula are as follows:
Wherein, TpFor the generator electromagnetic torque quiescent value under target operating condition.
8. according to claim 7 have the blower award setting device for actively supporting power grid function, which is characterized in that
The calculation formula of propeller pitch angle variable quantity are as follows:
Wherein, Δ β is propeller pitch angle variable quantity, Δ TeFor the pre- variable of generator electromagnetic torque, Δ Te=Tp-Tc, TcFor current working
Under generator electromagnetic torque value, K be wind-driven generator wheel-box reduction ratio, k (β, λ) be wind wheel turning moment and wind wheel oar
Slope between elongation β, λ are tip speed ratio.
9. according to claim 8 have the blower award setting device for actively supporting power grid function, which is characterized in that
K (β, λ) is obtained by simulation calculation, calculation formula are as follows:
Wherein, T is wind wheel turning moment.
10. according to claim 6 have the blower award setting device for actively supporting power grid function, feature exists
In the generator power setting value under target voltage includes active set value of the power P and reactive power setting value Q, active power
Setting value P and reactive power setting value Q can change according to wind speed power curve combination Power Systems to be required to precalculate
Out.
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CN117277452A (en) * | 2023-11-23 | 2023-12-22 | 中国电力科学研究院有限公司 | Method and device for fast active control of doubly-fed wind turbine generator |
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CN104074679A (en) * | 2014-07-02 | 2014-10-01 | 国电联合动力技术有限公司 | All-wind-speed limited-power optimal control method for variable-speed and variable-pitch wind generation set |
CN105986961A (en) * | 2016-04-28 | 2016-10-05 | 华北电力大学 | Power optimal control method for variable-speed and variable-pitch wind turbine |
CN108167120A (en) * | 2017-12-11 | 2018-06-15 | 浙江大学 | A kind of variable pitch bending moment combination control method of Variable Speed Wind Power Generator |
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CN117277452A (en) * | 2023-11-23 | 2023-12-22 | 中国电力科学研究院有限公司 | Method and device for fast active control of doubly-fed wind turbine generator |
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